How to change the mode group:
choose the low mode ,wait about 5 seconds ,when you see flashing ,close your flashlight.then open it , you can switch to 3mode group or 5mode group.

Features:
(1)Mode memory function: if the flashlight is turned on more than 3seconds ,current mode can be memoried.Turn it off and then turn it on ,still the original mode.
if less than 3seconds ,Turn it off and then turn it on ,it goes into the next mode.
(2)Low voltage protection function: when the voltage of battery is 2.9-3.1V,the flashlight flashes 2times/sec with low brightness,it's a low voltage alarm.
(3)Battery reverse protection:if your battery is reversed,dont worry ,no any problem will happen.

Kindly Note:
You can choose the different led wick,the price will be different!
This flashlight can work with 18650 button battery and flat battery.